September in Krabi is the coldest month of the year. In September, the weather in Krabi is typically hot. Average daily high temperature in September is about 30 degrees above zero. On average, Krabi has 27 rainy, 2 cloudy, and 1 partly cloudy day in September. The rains are usually heavy. September as well as March, April, May, and June is considered the most uncomfortable time to visit Krabi.